Improved burglar-alarm



| SILVERNAIL."

. Burglar Alarm.

Patented. Oct. 26, I869.

dinitrd swat the alarm. v

A represents a door or gate, hinged by the hinges B ailment (itililirr.

ISAAC SILVERNAIL, or BYRON-MICHIGAN.-

IMPROVED BURGLAR-ALARM The Schedule referred to in these Lettem.Patentand making part of the same.

To all whom it may concern Be it known that I, [sAAc SILVERNAIL, ofByron,

in the county of Shiawassee, and in the State of Mich igan, haveinvented certain new and useful Improvements in Self-Alarm for Gates andDoors; and do hereby declare that .the following is a-full, clear, and

exact description thereof, reference being bad to the accompanyingdrawings, and to the letters of reference marked thereon, making a partof this specification. The nature of my invention consistsinthe'construction and arrangement of a self-alarm, to guard againstburglars, and is applicable to gates as well as doors.

In order to enable others skilled in the art to which my inventionappertains, to make and use the same, I will now proceed to describe itsconstruction and operation, referring to the annexed drawings, in which-Figure l is a side elevation ofthe entire apparatus, and Figure 2 is aplan view of the spring that strikes T6 the lower hinge is attached asmall rod,a, which is provided with a pulley or wheel, 0.

This wheel is, by acord,;b, connected with a small wheel, D, attached tothe large wheel E, which may be mounted in any convenient place, thecord 11 passing around one or more pulleys, (I, so that when the door isopened the cord will revolve the large wheel E.

The wheel D. is, by-another cord, e, connected with a spring, F, in sucha manner that the spring will act in the opposite direction, turning thewheel E so as to unto set my hand, this 6th day of September, 1869.

close the door as soon as the force is removed'from the same.

At a suitable point is suspended or secured a bell, G, which isstruck bya wire spring, H, of the peculiar form shown in fig. 2.

At one end it forms a coiled spring, f, secured to a wall, or othersuitable support, then bent so as to form the hammer g, which isinserted in'the bell G, and its outer end projecting along the frontside of the wheel E,

On the front side of this wheel is a series of pins, v t' i, which, whenthe door is being opened and the wheel revolves, raises the outer endot'the spring H, and as it springs down or back after it leaves each pin,the hammer-part g strikes the bell G.

This deviceis very simple, and can be put up in any place desired, andconnected either with the upper or lower hinge.

When the apparatus is to be attached to gates, the alarm-mechanism maybe placed in the house, and the cord b carried through tubes, so as tomake the connection.

Having thus fully described my invention,

What I claim as new, and desire to secure by Letters Patent, is-

1. The wire H, constructed or'hent as described, so as to form the coilspring f and hammer g, substantially as and for the purposes herein setforth.

2. The arrangement of the wheel E, provided with pins t 1, wheel orpulley -D, cords b 6, spring -F, and

pulley 0, all substantially as and for the purposes herein set forth.

3. The combination of the gate or door A, hinge B, Q

pulleys O D, wheel E, with pins 'i i, cords b 0, spring F, bell G, andwire H, all constructed as described, and for the purposes set forth.

In testimony that I claim the foregoing, I have here- ISAAO SILVERNAIL.Witnesses: 0.1L LEMON, J. A. OLMSTED.

